Filling stop mechanism for looms



Feb. 10, 1931. H. H. BURDETT FILLING STOP MECHANISM FOR LOOMS Filed June 27, 1930 4 SheetsSheet l By ATTORNE Y Feb. 10,1931. H. H. BURDETT FILLING STOP MECHANISM FOR LOOMS Filed June 27, 1930 4 Sheets-Sheet 2 R; T wa m v .m NW3 A WW/ Ml BY Feb. 10, 1931. H. H. BURDETT 9 FILLING STOP MECHANISM FOR LOOMS F'ilecl June 27, 1930 4 Sheets-Sheet 3 VENTOR ATi'RA/EY Feb. 10, 1931. 4 BURDETT 1,791,789

FILLING STOP MECHANISM FOR LOOMS Filed June 27, 1950* 4 Sheets-Sheet 4 //v VENTO R? M 4, M

A TTORNE Y Patented Feb. 10, 1931 TSTATES PATENT OFFICE f nonacn H. BURDETT, or HOPEDALE, MASSACHUSETTS, ASSIGNOR 'ro nnnrna Conro- RATION, or HOPEDALE, M SSAcHusE'rTs, A CORPOBATIONOF MAINE FILLING QP C ANIS 1703 1400115 Application filed .Tune 27,

This invention relates to filling stop mechanisms for looms and is more particularly directed to that type of stop mechanism which. utilizes a center filling detector mounted on V the lay.

It is now the ordinary practice in the so called center fork or center filling. detector to providera detector member mounted substantially central between the ends of the lay and to cause such detector to be raised periodically to permit the shuttle to pass and then to feel for the filling and ascertain if filling has been laid in the shed. Should filling be absent on any pick, the filling detector will initiate the operation of a train of mechanism to'change the operation of the loom, as, for instance, effect loom stoppage,

In the practical operation of looms of the type mentioned, the first. pick of filling laid 9 in the shed following loom stoppage will frequently not properly support the tines ofthe detector, with the result that the loom may again be stopped unnecessarily, and it has been proposed heretofore to provide means to prevent such unnecessary stoppage of the 'loom on the first; pick when the loom is started. I

One of the objects of the present invention is to provide a center detector filling top motion for looms in which the detector parts are independentof the remaining features of the mechanism and yet is under control thereof during certain periods of the loom operation.

More specifically stated, the invention comprises a filling detector mounted upon the lay substantially central thereof and a shaft also mounted on the lay for rocking movement and provided with a cam having a detector lifting lobe and a locking lobewhereby during normal weaving operations the lifting lobe will raise the detector for the passage of the shuttle and then pass out of operation so that the detector may drop and ascertain whether or not filling has been laid in the shed. Should the detector determinethat filling is present in the shed the loom will continue to run, but should the detector detect absence of filling on any pick it will cause the locking lobe to be arrested and the shaft thereby prevente from. tu ning mo men 1930. Serial No. 464,226.

with the result that :the lay knockoff will b positioned for effecting loom stoppage as the lay moves frontwardly.

Another important feature: of the invention consists in a knockoff tumbler which is actuated to effect loom stoppage when the detector detects'absence of filling in the shed, and on backward movementof the lay it will yield bodily to the passage of. the lay knockoff While the latter remains in stopping posi tion. I

Still another important feature of the invention consists of the knockoff tumbler and its mounting whereby breakage of parts is prevented.

A further feature of the invention consists in the elimination of any special means Y for preventmg loom stoppageon the first pick when the loom is started-afterhaving been stopped.

p The invention and novel features thereof will best be made clear from the following description and the accompanying drawings of one good form thereof. 7 In the drawings:

Fig. 1 is a perspective view of a loom provided with the present invention, some of the parts being broken away;

Fig. 2 is a sectional elevation through the lay showing the relation of parts when the center detector finds filling in the shed as the lay heats up; 1

Fig. 3 is a similar sectional view showing more particularly the details between the rock shaft and the filling detector, the latter being shown as in its raised position, for the passage of the shuttle; v

Fig. 4 is a front elevation at thecenter of the lay showing the fillingdetector and rock 9 shaft Fig. 5 is a sectional elevation through the lay showing the relation of parts when the detector detects absence of filling in the shed andthereupon locks the rock shaft from rotative movement;

Fig. 6 is e a detached detail showing the relation of parts as the lay heats up and the knockoff tumbler is actuated to stop the loom on absence of filling Fig. 7 is a detail illustration of the knock off tumbler Fig. 8 is a diagrammatic view showing the normal position of parts as the lay heats up andfilling has been laid in the shed;

F ig 9 is a similar-view showing the relation of parts as the lay beats up when filling is absent from the shed;

Fig. is a similar view showing the relation of parts on the first pick subsequent-to loom stoppage as the lay heats up and move ment of the shipper is prevented;

Fig. 11 is a similar view showing the relation of parts when the lay has passed frontwardly substantially to its front position;

Fig. 12 is a similarview showing the relation of parts as the lay goes back.

The loom frame may be of usual construction and as shown-comprises the side frames 1 between which extends, a breast beam 2 having a shipper stand 3 provic ed with the usual slot f and holding notch 5 for the shipper 6 which as shown in 1 is held in loom running position.

The lay 7 has the usual lay swords 8 and is given its movement through the usual connections with the crank shaft.

Mounted on the front of the lay 7 is a bracket 9 which may be secured to the lay by bolts 10, and such bracket is provided with theoutsta'nding members 11 in the upper portions of which is mounted the filling deteotor. In the present instance ofthe inven tion, the filling detector comprises the rocker 12 to which are secured the detecting tines 13 by a plate 14 held to the rocker by the screws or other fasteners 15.

The rocker 12 may be supported by the side members of the bracket in any approved manner for rocking movement, but as hereishown each side member of the bracket is provided with a threaded member 16 having the conical end portion 17 Fig. l, which seats in a corresponding recess in the rocker 12, whereby the rocker and filling detector may have imparted thereto the detecting movements. v r

The bracket 9 is provided with a plunger guide 18, Figs. 3 movable plunger 19 connected to the rocker 12. The connection between the rocker 12 and the plunger 19 is constituted by a link 20 connected at one end to the top of the plunger andat its other end to'an adjustable stud 21. the construction being such that the filling detector is raised and lowered the plunger 19 will partake of the detecting movements.

Mounted for rocking movement on the lay is the rock shaft 22, bearings for which may be formed in an extension 23 of the bracket 9 adjacent the center detector, and the outer portion of which is mounted in a bearing 24 secured to the lay. p

The rock shaft 22 is given its rocking moveand 5,in whichis a freely mcnts by a yielding connection with the loom frame, so that during lay movements the rock shaft will be turned in its bearings. In the pr sent instance of the invention the rock shaft 22 has a pinion 25 secured thereto which meshes with an idler pinion 2r; mounted upon a bracket 27 secured to the lay.

The bracket 27 has a stud 28 on which is mounted a toothed segment 29, the teeth of which engage the teeth of the idler Pivotally connected to the segment 29 is the rock shaft actuator 30 which, as shown, extends frontwardly and downwardly from the segment and passes through a rocking sleeve 31 mounted on the loom frame. The actuator 30 is normally under the influence of yielding means, such asthe spring 32, interposed between a collar 33 fastened on the actuator or rod30 and a suitable collar 3e at the lower portion of the actuator, the construction being such that as the lay partakes of its forward and backward movements the actuator 30 will transmit to the segment 29 a movement first in one and then in the opposite direction, thereby transmitting such movements to the rock shaft 22 through the train herein described.

The spring 32 serves to yieldingly actupon the actuator to permit the segment to remain idle as the lay moves frontwardly when the rock shaft 22 is held from rotative movement as will further appear.

'Secured to the rock shaft 22 in any suitable manner as by a key is a cam located substantially below the plunger 19 and such cam is of novel construct-ion.

As shown more clearly in Figs. 3 and '5, the cam has a lifting lobe 35 the purpose of which is to act upon the lower end of the plunger19 and lift the filling detector into its raised position as the lay goes back, as indicated in Fig. 3, to thereby permit the passage of the shuttle during its picking movement.

As the lay moves frontwardly the direction of rotative movement of the shaft 22 is reversed, thereby permitting the filling detector to feel for the filling in the shed.

The cam is also provided with a locking.

lobe 36 which is substantially diametrically opposite to the lifting lobe 35, as indicated in Fi s. 3 and 5. r

Should the filling detector detect presence of filling a in the shed as the lifting lobe 35 passes from under the plunger, the detector will be held in position as indicated in Fig. 2, thereby holding the plunger 19 suiiiciently elevated so that as the lay moves frontwardly,

the locking lobe 36 will pass beneath the end' of the plunger 19 out of engagement therewith, as indicated in Fig. 2, and the rock shaft will continue to be rocked first in one and then in the other direction during lay movements, and this will continue so long as arrested and the lower end of the Since the rock shaft is prevented from rotating, the segment 29 Wlll be arrested and this condition is permitted under the action of the spring 32. v

The rock shaft 22 at its Outer end portion carries a lay knockoff which is constituted by cutting the end portion of the shaft longitudinally for a short distance, say about one and one-fourth inches (Figs. 1 and 6) thus providing the shaft with a flattened surface 37 at one side and a rounded surface 38 at the opposite side. This formation of a knock ofi element on the rock shaft 22 carried by the lay constitutes an important feature of the invention as it obviates objectionable projections on the rock shaft and may yet be positioned to effect loom stoppage when the detector detects absence of filling in the shed, which will later appear.

Adjustably mounted onthe loom side is a support or bracket 39 for a knockofi tumbler of novel construction; The support '39 for the tumbler is shown as provided with a slot 40 through which passes a bolt 41 whereby the position of the support and the tumbler which is mounted thereon may be varied according to circumstances of use. I

The support 39 has an upwardly extending portion 42 which may be bifurcated at its terminal, at 43, and mounted in the bifurcation 43 is a knockoff tumbler 44 having a pivot pin 45 extending from each. side there of and engaging a vertical slot 46 formed in the support or upright portion 42. p The support for the tumbler has an opening in the portion thereof below the bifurcation 43, in which is mounted a pin or plunger 47 Figs. 1 and 6,normally pressed upwardly against the bottom portion of the knockoff tumbler by a spring 48 seated in a support below the plunger, the result being that the knockoff tumbler 44 may have not only a rocking movement about its pivotal mounting in the support but may also yield downwardly. q The knockofi tumbler 44, which is shown in detail in Fig. 7', is-provided with an opening or slot 49 throughwhich passes the rod 50 which is joined to the knockoff tumbler at 51, while the opposite endis connected at 52 to a shipper knockofi 53 pivotally mounted at 54 and having a side projection 55 which normally bears upon the front of the shipper 6 when the parts are in running position.

The slot or opening 49 of the knockoff tumbler extends upwardly and is bridged over at its upper portion by a curved surface 56 1ocated frontwardly of a shoulder 57 which is adapted to be engaged by the lay knockofi when absence of filling in the shed is detected by the'filling detector and'the rock shaft is consequently locked from rocking movement b the lockmg lobe 36 engaged w1th the lower end of the plunger 19.

During normalweaving operations when filling is laid in the shed and the lay is mov- 7 in frontwardl as indicated in Fi 2 the rock shaft 22 will be rotated by its actuator 30 in a clockwise direction and the flat surface of the rock shaft will be presented in a substantially horizontal position, as indicated in Fig. 2, and pass over and above the top or shoulder portion of the'knockofl' tumbler 44, and the loom will continue to run. This condition is represented graphically in ig. 8 where it will be noted that the flat surface 37 of the, rock shaft has passed over and frontwardly of the knockoff tumbler 44 without causing its actuation.

Should thedetector, however, detect absence of filling in the shed as the lay moves frontwardly, as indicated in Fig. 5, and as the reel: shaft 22 is being turned clockwise, viewing Fig. 5, the locking lobe will be engaged by the lower end of the plunger 19. and arrest rockingmovement of the rock shaft while the flat surface 37 is in a substantially verti cal position, so that on further frontward movement of the lay the flat surface 37 will engage the shoulder portion 57 of the knockoff tumbler 44and cause it to turn about its pivotal mounting 45, thereby giving frontward movement to the rod 50 and permit loom stoppage. 7

After the loom has been stopped the rock shaft remains locked by the locking lobeand pl nger as the lay moves back, but owing to the rounded surfaces 38 on the rock shaftand 56 on the upper portion of the knockofi' tumbler, these rounded surfaces will pass over each other, causing the knockoff tumbler to be depressed, thereby permitting the rock shaft to move to its rearward position even though it be locked and until the movement of the rock shaft has again brought the lif ing lobe 35 into position to raise the detector for the passage of a shuttle.

When the loom is stopped by failure or breakage of filling it will ordinarily come to rest with the lay at about bottom centre or approximately so and the loom attendant will pick out any partial or defective pick of filling, and, with the shuttle supplied with filling and in the shuttle box will turn the loom over by hand moving the lay to substantially back position and pick the shuttle through the shed by manual effort, with the result that the upon the top shouldered portion of the lrnockoff tumbler and depress it from its upper position, as indicated in Fig. 10, thereby permitting the lay to beat up the substantially slack filling without effecting loom stoppage. As the lay goes back after the first pick of filling following loom stoppage and the fill-' ing has been beaten up, the rock shaft will still belocked with the flat, surface 37 in substantially vertical position, facing frontwardly, though somewhat inclined, as in Fig. 11. As the lay goes back from rock shaft position frontward of the knock-off tumbler, the rounded surfaces 38 of the rock shaft and the rounded surface 56 of the knock-off tumbler will engage, and, owing to their contour, will cause the knock-off tumbler to be again depressed against the action of the spring-held plunger 47, as indicated in Fig.

. 12, and as the rock shaft is turned in a contraclockwise direction on backward movement of the lay, the lifting lobe 35 will engage the lower end of the plunger 19 and normal operation of the loom will continue so long as I intact filling is laid in the shed.

Usually the filling detector will move from its raised position, indicated in Fig. 3, to its lowered position by the weight of the detecting times, but in some instances it may be desirable to augment the tendency of the detector to move downwardly as the lifting lobe 35 passes from under the plunger 19.- To this end a light spring 58 may be connected to the detector at one end and to a hook at its opposite end but such assistance from a spring is not always necessary to effect proper movement of the detector.

From the construction described as one good embodiment of the present invention it will be obvious that the invention provides a rock shaft on the lay independent or separate from the detector, thereby permitting the detector to act with sensitiveness in determining the presence or absence of filling in the shed, and that in order to permit the shuttle to pass, the rock shaft is provided with the lifting lobe which acts upon the plunger connected to the detector as the lay goes back, and as the lay moves frontwardly and the rock shaft is consequently turned in the opposite direction the detector on absence of filling will cause the plunger to engage in front of the locking lobe of the cam and arrest rocking movement of the rock shaft, thereby positioning the slabbed-ofi portion of the rock shaft in a substantially vertical position, as indicated in Fig. 6, to effect loom stoppage.

The invention likewise provides a simple and effective means for preventing loom stoppage by the detector following the first pick of the shuttle subsequent to loom stoppage or when the loom is againstarted after being stopped, and such result is efiected by holding the shipper 6 from detachment from its holding notch as hereinbefore more fully described.

What is claimed is:

1. In a loom, the combination of the lay, a filling detector mounted on the lay to detect the presence or absence of filling in the shed, a shaft mounted for rocking movement on the lay and having a cam provided with two lobes, disposed substantially opposite each other relative to the axis of said shaft, one constituted as a lifting element for the filling detector and the other as a locking element to arrest rotation of the shaft when the detector finds no filling laid in the shed, a knock-ofi tiunbler, and a part carried by the shaft for actuating the knock-off tumbler when rotative movement of the shaft is arrested by the locking lobe of the cam.

2. In a loom, the combination of the lay, a filling detector mounted on the lay to detect the presence or absence or filling in the shed, a plunger connected to the detector, a shaft mounted on the lay for rocking movement and having a cam provided with two lobes, one constituted as a lifterfor the filling detector to permit the shuttle to pass and the other as a lock to obstruct rotative movement of the shaft by engagement with the plunger when the detector detects absence of filling in the shed, a knock-off, and a part on the shaft for actuating the knock-olf to efiect a change in the loom operation when the rotative movement of the shaft is obstructed by engagement of the plunger with the'locking lobe of the cam.

3. In a loom, the combination of the lay, a shaft mounted on the lay for rocking move ment, a filling detector mounted on the lay and having a plunger independent of said shaft, a cam on the shaft having a plunger lifting lobe and a locking lobe, yielding means for turning the shaft as the lay is moved towards and from the front of the loom, a knock-off tumbler, and a part on the shaft for actuating the tumbler to effect loom stoppage when the detector finds absence of filling in the shed and the locking lobe of the cam is locked by the plunger.

4. In a centre filling detector stop motion for looms, the combination of the lay, a shaft mounted on the lay for rocking movement and provided with a cam having a lifting lobe and a locking lobe, a filling detector mounted on the lay independent of said shaft and having a connected plunger, an actuator for turning the shaft during lay movements to cause the lifting lobe to move into engagement with the plunger and raise the detector for the passage of a shuttle and then pass out of engagement with the plunger to permit the detector to determine the presence or'absence of filling in stoppage whenthe detector detects the shed, yielding means associated with the actuator to permit the plunger to arrest rotative movement of the shaft by locking engagement with the locking lobe of the cam should the detector detect absence of filling, and means operated by the shaft to efieet loom stoppage when the shaft is locked from rotative movement by the locking lobe of the cam.

5. In a loom, the combination of the lay, a rock shaft mounted on the lay and having a flattened portion, an mounted filling detector, yielding means for rocking the rock shaft d ing lay movements, a knock-oft tumbler, means controlled by the detector to present the iiattened portion of the rock shaft operatively to the knock-off tumbler and elfect loon absence of filling in the shed.

6. ln a loom, the combination of the lay, a rock shaftmounted on the lay for 1 c movement and having a flat portion, a l ing detector mounted on the lay, yieldin means for r cking the rock shaft durin lay movements, a knock-ofi tumbler, interengaging locking members between the detector and rock-shaft helc from locking engagement by filling laid in the shed to 1 ermit the rock-shaft to be turned by said yielding means and pre ent the flat portion thereof in non-engaging relation with the knock-off and to prevent turning movement of the rock-shaft to present the flat portion thereof in operative relation the knockoff when the detector detects absence of fill-- ing and said members have been interlocked.

7. In a loom, the combination of the lay, a rock-shaft mounted on the lay and having a. knock-oil portion, a filling detector mounted on the lay, yielding means for turning the rock-shaft during lay movements, means controlled by the ml tor to lock the rock-shaft from turning movement when filling is absent, and a knock-off tumb er mounted for movement in either of two directions by the knock-off portion of the rock-shaft.

8. 111 a loom, the combination of the lay, a rock-shaft mounted on the lay and having a flattened knock-oil portion, a knock-oil tumbler, a filling detector mounted on the lay, means acting yieldingly to turn the rock-shaft during lay movements to present the flattened portion of the rock-shaft in non-engaging relation with the knock-oh? tumbl when the detector detects pressure of filling in the shed that the flattened portion may pass over the tumbler, and loclnng m ans controlled b the fillin detector to lock the rock-shaft from turning movement wh ,1 the detector detects absence of filling in the shed that the flattened portion of the rock-shaft may actuate the knock-oil tuabler and effect loom stoppage.

9. In a centre detector filling stop motion independently fllllllg detec for looms, the combination of the lay having a rock-shaft provided with arigid knockoff portion, yielding means for turning therock-shaft during lay movements, a centre filling detector, means controlled thereby to lock the rock-shaft'from turning movement on d tection of filling absence, a knock-0E um r adapted to be aotuatedx y rigid knockoff portion of the rock-shaft when the. shaft is locked, yielding means normally noting to maintain the knock-oil tumbler in the path, of movement of the rigid'knockoff portion of said'shaft to effect loom stoppag and y-ieldable to thepassage of said rigidportion of the rock-shaft as the lay goes back. v

10. Acentre detector filling stop motion for looms, comprising a rock-shaft mounted on, the lay and having a knock-off portion,

yielding means for turning the rock shaft during lay movements, a centre filling, do

teotor, means controlled thereby for locking the rock-shaft when the detector deteotsabscnce of filling, a pivotally mounted knockofl tumbler which is moved pivotally by the knock-oil portion of the. rock-shaft to effect. loom stoppage, anda spring acting to hold the tumbler in raised position and 'yieldablethe shaft knock-oil and tumbler may'engage as the lay goes back when the loom is again started, and yielding means to permit the tumbler to be bodilydepressed as thereunded suriaces pass each other on backward movement of the lay.

12. A centre detector filling stop motion including a knock-oil" on the lay, a knock-oil tumbler, a shipper, a shipper knock-off connected to the knock-off tumbler, a pivotal mounting for the knock-off tumbler, and a spring normally acting to hold the knocloofl tumbler in normal position and yielda'ble under the frontward stress of the lay knoc off to permit the knock-off tumbler to be moved bodily from normal positi n when the shipper is held from movement on the first pick following loom stoppage,

13. A centre detector filling stop motion including a filling detector mounted on the lay, a knock-off carried by the lay and position-ed by the filling detector to effect loom stoppage on absenceor undue slackness of filling, a pivotally mounted knock-01f tumbler, yielding means normally acting to hold the knock-off tumbler in bodily raised position for actuation by the lay knock-off on absence or undue slackness of filling and yieldable to permit downward bodily movement of the knock-or? tumbler by the lay knock-off when the shipper is held from movement. 7

14. A centre detector filling stop motion including a lay knock-off, a knock-off tumbler, a support for the knock-off tumbler, a pivot for the knock-off tumbler to permit swinging movement of the tumbler by the lay knock-off, a substantially vertical sliding connection between the support and knockoff tumbler, a spring normally acting to hold the knock-ofi tumbler in raised position on the support, a shoulder formed on the tumbler for engagement by the lay knock-oil to effect loom stoppage and a rounded upper surface formed on the knock-oil tumbler frontward of the shoulder that the lay knockofi may bodily depress the knock-off tumbler as the lay goes back with the lay knockoff in stopping position.

15. As an article of manufacture, a knockoff tumbler having a pivot pin at its lower portion and a substantially vertical shoulder at its u per portion, a rounded surface extended rom the top of the shoulder frontward thereof, and lugs extended from the side portion of the knock-off tumbler for connecting the tumbler to a knock-off connection.

16. As an article of manufacture, a knockoif tumbler having a pivot pin at its lower portion and provided with an opening or slot extending upwardly therefrom, a shoulder formed on the tumbler at the upper terminal part of the opening or slot and a rounded surface bridging the upper end of the opening or slot and extended frontwardly from the shoulder.

In testimony whereof, I have signed my name to this specification.

HORACE H. BURDETT. 

